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However, FastAPI's automatic validation prevents 10-15% of invalid requests before business logic, reducing downstream processing. For most production APIs, the difference is negligible; bottlenecks typically occur at database, not framework level."},{"question":"Do I need to write validation code in Express.js?","answer":"Yes. Express.js has no built-in validation, so you must add middleware like `express-validator` or `joi` (3-4 extra package dependencies). FastAPI includes Pydantic validation by default—define Python types and validation happens automatically with detailed error messages in JSON responses."},{"question":"Which is better for microservices?","answer":"FastAPI excels for data-heavy microservices (financial, analytics, ML) due to automatic validation and docs. Express.js wins for lightweight event-driven services and serverless functions (50-100ms startup vs 150ms). 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